倾斜极化器自旋力矩振子中的零场进动和滞后阈值电流
Zero Field precession and hysteretic threshold currents in spin torque oscillators with tilted polarizer
摘要：
利用非线性系统理论和数值模拟绘制了倾斜极化器自旋力矩振荡器（TP-STO）在零场作用下的静态和动态相图，发现在足够大的电流下，即使很小的倾斜角（β> 1 °）也会导致自由层在零场中的稳定进动。在一个相当大的倾斜角范围内，1度<β <19度，我们发现共存的静态和滞后切换之间的这些只使用电流。在更窄的窗口（1度<β <5度）中，其中一个静态状态变成极限环（进动）。在零磁场中静态和动态的共存是倾斜极化器所特有的，并且导致TP-STO操作的上阈值电流和下阈值电流的大滞后。
英文摘要：
Using non-linear system theory and numerical simulations we map out the static and dynamic phase diagram in zero applied field of a spin torque oscillator with a tilted polarizer (TP-STO).We find that for sufficiently large currents, even very small tilt angles (beta>1 degree) will lead to steady free layer precession in zero field. Within a rather large range of tilt angles, 1 degree< beta <19 degree, we find coexisting static states and hysteretic switching between these using only current. In a more narrow window (1 degree<beta<5 degree) one of the static states turns into a limit cycle (precession). The coexistence of static and dynamic states in zero magnetic field is unique to the tilted polarizer and leads to large hysteresis in the upper and lower threshold currents for TP-STO operation.
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